As a common disease in proctology, simple anal fistulas can be diagnosed through visual inspection and palpation. For high-positioned complex anal fistulas, which cannot be accurately assessed through just visual inspection and palpation, the use of instruments may be necessary. Currently, magnetic resonance imaging (MRI) is recommended as the most accurate method for evaluating anal fistulas, and it is considered the gold standard for examining the course of the fistula tract and the location of the infection.